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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
* Author: Stefano Brivio <sbrivio@redhat.com>
* Author: David Gibson <david@gibson.dropbear.id.au>
*/
#ifndef FWD_H
#define FWD_H
struct flowside;
/* Number of ports for both TCP and UDP */
#define NUM_PORTS (1U << 16)
bool fwd_port_is_ephemeral(in_port_t port);
enum fwd_ports_mode {
FWD_UNSET = 0,
FWD_SPEC = 1,
FWD_NONE,
FWD_AUTO,
FWD_ALL,
};
#define PORT_BITMAP_SIZE DIV_ROUND_UP(NUM_PORTS, 8)
/**
* fwd_ports - Describes port forwarding for one protocol and direction
* @mode: Overall forwarding mode (all, none, auto, specific ports)
* @scan4: /proc/net fd to scan for IPv4 ports when in AUTO mode
* @scan6: /proc/net fd to scan for IPv6 ports when in AUTO mode
* @map: Bitmap describing which ports are forwarded
* @delta: Offset between the original destination and mapped port number
*/
struct fwd_ports {
enum fwd_ports_mode mode;
int scan4;
int scan6;
uint8_t map[PORT_BITMAP_SIZE];
in_port_t delta[NUM_PORTS];
};
void fwd_scan_ports_tcp(struct fwd_ports *fwd, const struct fwd_ports *rev);
void fwd_scan_ports_udp(struct fwd_ports *fwd, const struct fwd_ports *rev,
const struct fwd_ports *tcp_fwd,
const struct fwd_ports *tcp_rev);
void fwd_scan_ports_init(struct ctx *c);
uint8_t fwd_nat_from_tap(const struct ctx *c, uint8_t proto,
const struct flowside *ini, struct flowside *tgt);
uint8_t fwd_nat_from_splice(const struct ctx *c, uint8_t proto,
const struct flowside *ini, struct flowside *tgt);
uint8_t fwd_nat_from_host(const struct ctx *c, uint8_t proto,
const struct flowside *ini, struct flowside *tgt);
#endif /* FWD_H */
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